/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <AK/Types.h>
#include <Kernel/Process.h>

namespace Kernel {

KResultOr<pid_t> Process::sys$getpid()
{
    REQUIRE_PROMISE(stdio);
    return pid().value();
}

KResultOr<pid_t> Process::sys$getppid()
{
    REQUIRE_PROMISE(stdio);
    return m_ppid.value();
}

KResultOr<int> Process::sys$get_process_name(Userspace<char*> buffer, size_t buffer_size)
{
    REQUIRE_PROMISE(stdio);
    if (m_name.length() + 1 > buffer_size)
        return ENAMETOOLONG;

    if (!copy_to_user(buffer, m_name.characters(), m_name.length() + 1))
        return EFAULT;
    return 0;
}

KResultOr<int> Process::sys$set_process_name(Userspace<const char*> user_name, size_t user_name_length)
{
    REQUIRE_PROMISE(proc);
    if (user_name_length > 256)
        return ENAMETOOLONG;
    auto name = copy_string_from_user(user_name, user_name_length);
    if (name.is_null())
        return EFAULT;
    // Empty and whitespace-only names only exist to confuse users.
    if (name.is_whitespace())
        return EINVAL;
    m_name = move(name);
    return 0;
}

KResultOr<int> Process::sys$set_coredump_metadata(Userspace<const Syscall::SC_set_coredump_metadata_params*> user_params)
{
    Syscall::SC_set_coredump_metadata_params params;
    if (!copy_from_user(&params, user_params))
        return EFAULT;
    if (params.key.length == 0 || params.key.length > 16 * KiB)
        return EINVAL;
    if (params.value.length > 16 * KiB)
        return EINVAL;
    auto copied_key = copy_string_from_user(params.key.characters, params.key.length);
    if (copied_key.is_null())
        return EFAULT;
    auto copied_value = copy_string_from_user(params.value.characters, params.value.length);
    if (copied_value.is_null())
        return EFAULT;
    if (!m_coredump_metadata.contains(copied_key) && m_coredump_metadata.size() >= 16)
        return EFAULT;
    m_coredump_metadata.set(move(copied_key), move(copied_value));
    return 0;
}

}
